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<body>
  <script>
    const data = [
      { id: '01', name: '张大大', pid: '', job: '项目经理' },
      { id: '02', name: '小亮', pid: '01', job: '产品leader' },
      { id: '03', name: '小美', pid: '01', job: 'UIleader' },
      { id: '04', name: '老马', pid: '01', job: '技术leader' },
      { id: '05', name: '老王', pid: '01', job: '测试leader' },
      { id: '06', name: '老李', pid: '01', job: '运维leader' },
      { id: '07', name: '小丽', pid: '02', job: '产品经理' },
      { id: '08', name: '大光', pid: '02', job: '产品经理' },
      { id: '09', name: '小高', pid: '03', job: 'UI设计师' },
      { id: '10', name: '小刘', pid: '04', job: '前端工程师' },
      { id: '11', name: '小华', pid: '04', job: '后端工程师' },
      { id: '12', name: '小李', pid: '04', job: '后端工程师' },
      { id: '13', name: '小赵', pid: '05', job: '测试工程师' },
      { id: '14', name: '小强', pid: '05', job: '测试工程师' },
      { id: '15', name: '小涛', pid: '06', job: '运维工程师' }
    ]

    const tree = arrToTree(data)
    console.log(tree)

    function arrToTree (data) {
      let tree = []
      if (!Array.isArray(data)) {
        return tree
      }
      // 将数组转换成对象（键值对），将ID作为属性名，原来的数组里的对象作为属性值
      let map = {}
      data.forEach(item => {
        map[item.id] = item
      })
      // 通过对象的属性名（ID）来找到父级节点，将存到map里的对象取出来放到父级节点的childere数组中
      data.forEach(item => {
        let parent = map[item.pid]

        // 修改对象的属性
        delete item.pid
        item['label'] = item.name
        delete item.name

        if (parent) {
          ; (parent.children || (parent.children = [])).push(item)
        } else {
          tree.push(item)
        }
      })
      return tree
    }

  </script>
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